I hardly use that gmail address for anything outside of google groups and github.
Tumblr probably has an "invite friends" feature where it offers to suck up your address book. Maybe a few software developers you corresponded with in the past used that feature.
edit: I didn't consider that they may have just randomly picked any category and getting "Developers" was random. It just surprised me, out of ~40 categories.
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I hardly use that gmail address for anything outside of google groups and github.
Tumblr probably has an "invite friends" feature where it offers to suck up your address book. Maybe a few software developers you corresponded with in the past used that feature.
edit: I didn't consider that they may have just randomly picked any category and getting "Developers" was random. It just surprised me, out of ~40 categories.